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So I have a Conti Competition tubular that’s been stuck to my carbon DA50 rim for a few (3), years. Not been used since 2015, but am now going to be back on racing. Question is…..the tub is well n truly stuck fast- no signs of glue degradation, and I can’t pull it off without a considerable amount of force. Used Vittoria Mastik. Should I be looking to re-glue this as good practice, or if the bond seems secure, should I just leave??

The right to bear arms is slightly less ludicrous than the right to arm bears. (Chris Addison)

The glue does not last forever, but if it is stuck, it is stuck. Keep an eye on it, however (which I do regardless of age of the glue). Deflate the tire completely and check for gaps between the rim edge and the base tape, and for any separation between the tire and the base tape. Small separations between the tire and the edge of the base tape can be repaired with Barge cement without removing the tube.

If you are not careful removing the tube, then you can separate the tire from the tape. I use a plastic tire lever or a round screwdriver shaft and wiggle it back and forth under the tube up to the valve stem.

Oh, and I doubt heat will help adhesion, though I've read of some people using it to help remove old glue from a rim. Never tried that myself.

“If you save your breath I feel a man like you can manage it. And if you don't manage it, you'll die. Only slowly, very slowly, old friend.”

I was gonna say, the last 2 posts from yours OP, are spot on.
Any powdery edges can be touched up with a careful addition around the rim/tire interface, but if the tire feels stuck good, it usually is. If you can tear off the tire laterally, it was definitely not a good glue job.